[2.0.23] Rail support not placed on partial foundation

[AdeptX8]

Hello

In a normal game without mods, it is not always possible to install diagonal rail supports on the oil ocean of Fulgora. It has been experimentally established that if there is a foundation nearby, this can get this behavior.
Video: https://www.youtube.com/watch?v=iyxWa5ib6A0
Blueprint: https://pastebin.com/auJttv7T

[Rseding91]

Thanks for the report. This is an intended simplification of ghosts buildability on ghost tiles. If there is *any* ghost tile under an entity the entity can not be built. It was done this way because the tiles being built may invalidate the existing entity - if it was built first - or may provide support for the entity if it has not been built. But the game has no good way to know in which order things need to happen without a significant performance hit.